Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1988_24_2_a25, author = {G. G. Islamov}, title = {Two-sided estimates for $s$-numbers of integral operators that increase smoothness}, journal = {Differencialʹnye uravneni\^a}, pages = {353--356}, publisher = {mathdoc}, volume = {24}, number = {2}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1988_24_2_a25/} }
G. G. Islamov. Two-sided estimates for $s$-numbers of integral operators that increase smoothness. Differencialʹnye uravneniâ, Tome 24 (1988) no. 2, pp. 353-356. http://geodesic.mathdoc.fr/item/DE_1988_24_2_a25/